Relay Diagrams: Stereo to Bridged Mono Switched Outputs

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If your amplifier is capable of running in dual mode or mono, and is configured to run mono by using the left channel positive and the right channel negative outputs, then the diagram to switch between stereo and mono to the same pair of speakers (mostly woofers) is as shown below. Remember this will decrease the impedance by 1/2 and in theory double the power output of the amplifier. Be sure to check the specifications of your amplifier first.

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